Kinetics of the Dissolution of Copper in Aqueous Solutions of Aliphatic Diamines

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Abstract
The recent work on the mechanisms of the dissolution of copper in aqueous solutions of amines has been extended to the diamines. The chelating agents used were ethylenediamine, 1,3 propanediamine, and 1,4 butanediamine. The dissolution reaction is shown to involve two distinct steps. The first step is found to be an adsorption pre‐equilibrium. In the second step, two types of reaction compete: chelation and attack by a second ligand. Desorption of the complex follows these steps. In 1,4 butanediamine, the chelation step is not observable, while in ethylenediamine the chelation appears to be so fast as to obscure the bimolecular reaction. In propanediamine, both are evident. The reactions of the singly protonated species have been found to be solely by bimolecular attack.

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